Introduction Not implemented yet.  This uses point Lie symmetry.

The above section showed how to solve the nonlinear ode \(F\left ( x,y,y^{\prime },y^{\prime \prime }\right ) =0\) once it is determined it is exact as is, which is by finding the first integral \(R\) directly without finding an integrating factor first. This below gives few ode forms with the corresponding first integral \(R\) to use and how to find \(R\). These are collected from few papers I am studying now.